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Requirements Traceability

Lecture # 20

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Recap of Last Two Lectures

• We talked about different aspects of

requirements management, i.e.,managing the changes in requirementsin detail

• Requirements cannot be managed

properly if requirements traceability isnot implemented

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Tracing Requirements

• It is important to trace requirements

both ways– Origin of a requirement– How is it implemented

• This is a continuous process

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Classifications of Requirements

Traceability

• Backward-from traceability• Forward-from traceability• Backward-to traceability• Forward-to traceability

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Forward-from Traceability

• Links requirements to design and

implementation components

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Backward-to Traceability

• Links design and implementation

components back to requirements

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Backwards and Forwards

Traceability

Business plan

Requirements document

Design specification

Forward-to traceability

Forward-from traceabilityBackward-from traceability

Backward-to traceability

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Categories of Traceability

• Requirements-sources traceability• Requirements-rationale traceability• Requirements-requirements

traceability

• Requirements-architecture traceability• Requirements-design traceability• Requirements-interface traceability

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Requirements-Rationale

Traceability

• Links the requirement with a

description of why that requirementhas been specified. This can be adistillation of information from severalsources

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Requirements-Requirements

Traceability

• Links requirements with other

requirements which are, in some way,dependent on them. This should be atwo-way link (dependent on them andis-dependent on)

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Requirements-Design

Traceability

• Links requirements with specific

hardware or software components inthe system, which are used toimplement the requirement

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Requirements-Interface

Traceability

• Links requirements with the interfaces

of external systems, which are used inthe provision of the requirements

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A Generic Traceability Table

A

A

A

Aii

R01R02R03 Rnn

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Need for Traceability Policy

• Huge amount of information, which is

expensive to collect, analyze, andupdate

• Need to continuously update

traceability information

• A traceability policy is needed